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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9b4d1b3ca99ae9fe2699a7f0e0436ff8c085a3aab995013a7735bc13ca3799f' 
  AND token = 'UPGr1YoK0b6qPfWcaaNqMv3Ck11NCibBIBv8t8aJ9e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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