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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04cb1407ead1932736cffa5773cde35c2f617761ab2cce6c7bf9c46993c04a77' 
  AND token = 'nZs3KmCVy36ePsFcZIEU6JByvxoVBu6A8eqKDjV1wcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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