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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79943f160baf9a739eb772172bdcc31b8ce65b1f1198e1b90194abc2cdab9c52' 
  AND token = 'uN67xxGo+iJfdGLj7EodjGhYEzXPjQK+9n9eEtRlYa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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