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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc19a9de5e96a60c69c59fd5491fd09ccf2571ae1b8349b4fc5ee118e1b8c498' 
  AND token = 'DlT9Vloy+87Q41MZ6Tod/y/3X5xrb78aHiGfhYXgDsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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