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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b174bbcac9a5b4e0454c2b9877a1a2e4cdcd4baf2b3a69ec63db2ec7378d970c' 
  AND token = '1oZQCZAjUOoaPUn2WE5q4MpHKT8ow7mC78n9rWcz3G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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