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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5544048f763ea1ecd0f23fe32cebf01bc1503984e2f5887b7536d6f49af2c941' 
  AND token = 'T3LCNxm6Kw8WeiG/r6LvBhpUWhHcMa0evZN2ke2epCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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