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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1332ec3475175d0b395718dde24dc31f8089bd936e352712c8dc3444a990a7b' 
  AND token = '28GTslA3j/zMIsHTPP7PaKZ4FTQKgo1rmUkTEs6bysg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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