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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1b65e73afe68350923f21f8030b972ed6bdf25de2a0b6791a507ab34bd0870c' 
  AND token = 'ssEVKGko34B3Ytx1aTJhnTAunPQf7A/oSQplpxDE9eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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