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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4affae494f3baee3b7c88b6bf7ba8c38e71b7177348c09dcde42ea7cf6b3158' 
  AND token = 'g0JoFTgdpfoZSZaZhjCgMmIRJlDdKhxM/MjHQGXLYeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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