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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b66720f8cc8a109e0502bed5f2b2c7129cb41423b06c7dc781a038397733018' 
  AND token = 'UebEkVQBEkaeywimNSLcU0sd0T6WAi3yKWM62WR+Ccw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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