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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec0fa7d61952f417fc45e2a7996bb5b6f3a4fb3dbfcc91c7ce582499aefa23a7' 
  AND token = 'GcJUOro3YBf74AjCEFHJ3KstZebm4ZmGHIREC2lf9TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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