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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e91113de175cfa4ddd00fb8b94af9bb2adc66dc8e697f5d32fdbcc3ee5a226d5' 
  AND token = '5HKBlJcAy7cfPbOomXFlv7kVoecqxy/yhPj9aZBoQtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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