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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79481f460792daefd59e61637ea5a133cd3611f2ceb769462a1b863dbcedc82a' 
  AND token = 'LNEpHpTjQC/9geA36hZm0Ii1b1iQHhVySC9Pj/Ox4C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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