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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d9b28f4c79d62d2d75816889265ad0cbb9d24f6a1e7b1987d59b4bc22d05291' 
  AND token = 'eJPpexwtUOgvdaAhAsaASy2WIc1yCZdS/DihMmmTi9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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