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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcab1621a02bd59dbaa3585b19831d8ab69ff1ac053ffb614bb268f6dad03afc' 
  AND token = 'Pj/qa86BU6UtdbfcJ7QZ273XbLacf1+CKIPMlgzlby4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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