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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '790add14559d9edd2725b6ea8a821b055bf4379442d2654b8c3a66314757a967' 
  AND token = 'QShOPmIcmMhsshETai1n2+trIyHQR9z977NXHs1ozXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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