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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b21554bcbda2047df85955e600bc44efe9d17ea23dcdf601e233aa85260b2f05' 
  AND token = 'h+ZC7Ya6Hpv166xx+Rh2z+pk+bYep/aHVI2DsC5riVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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