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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d064958dc2994ead174464f54fe7e52814bc9fae9f745ab6968d0b37696bf96' 
  AND token = '+LhHP38WO+HCir6T/Pdf6hpE2OEHAEoI2Ib5irxP6Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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