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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b768afdb64a14233c254a990894a96691f73c9d6d8aeace812d6b8589a46fd0' 
  AND token = 'ocqcuBJqxYT1l4o5ltIYDtZoe4cbHPjZoIMA37cU9hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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