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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2612688d3c081f4911d2f828b3094e5d45948607a82fb265e0f214ebb3e42b4' 
  AND token = 'GiYj7Td5LU0dSsLXrpVVGeHWER0/T2NpFEJfvAJJHoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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