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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fd5d9b82bf56436767dd614f6ce1fb3ed76a714ffdcace5f3bf96b34b9b04a2' 
  AND token = 'Qnsnk42CPiVCN5PBVaBTlNPSV1X2mTGq9Le5S1hHwNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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