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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42162ae34a92cb3f515d2771697fc344200048798cbc405d9213b47cff7c3b37' 
  AND token = 'Q8A3RPMQ4tLFH372Uqq9kfrc8SwWqi3pUeRn5+PFKTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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