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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e006baafcd5a431e5fb5acccb5b2680539c3b3f125124749448b6f2ffc24604e' 
  AND token = 'HYgLEGvT90voE6KsMI2rWHP+eeo1JJbDeUyuo33OQGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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