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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2156f610afb5163f4f8b2c2bd7ff8efdd4cbeda40bb5d9582372e8f00bae5da' 
  AND token = '2fptSgg/zbV8ygvxs2VlFHpxWTjSlEvOq1gnP3f9elc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}