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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '424eff1653853f46ed70e1413b20cf9c01821abcd324b004a75464282a4911bb' 
  AND token = 'o3JUZ1PTB6J4Iv5Cp+/E+tMfE+ZSN/kX7cckcz/p2jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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