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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c929c16cb8f168091ea1ea1b279f84db8bd6cc8a8eb49b4da6d2bfb2c5cccdec' 
  AND token = '/xHDy3lE1jjem8OdPuSkjNLt3EMAUfcKgEw4zMeT80U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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