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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af9cee4d8ea92367ebba2b43e2d915098c60e3ce27d5a640f4ff111c24600c2e' 
  AND token = 'f1K4kp6FpNrg3t7h/WmeVLFeMoy7lSLoVYPbM8lTaII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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