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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cb8d704cf937fabf7581e03d8ca0e0223664a88e8f8cc2e6dba240eba22c2c6' 
  AND token = 'Z6yekvDopaTVnPgDZYycx11iutZTrpTB8TEt6ssPRek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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