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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63614910faabc04ddf601b13992b0f8223d482aa97c2bdd15c4caf0ccce3a137' 
  AND token = 'bQOTJ2TGB77fTI0S7ezD4x1qOgFJwLr5r8SF9G3Z5rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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