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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6a74899c671df9e6b677b3e9dba36e3ff91f5ee2ee2225812d0bc5cc22e01dc' 
  AND token = '0bTACZ4+C4+4bsVTB123qKn3+G1RsWKhn8Xx+vCcppk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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