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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cd45695fa3fa7c99561889bafbcc8b9c04a3d8436082168dd5bdc9baaa7cf84' 
  AND token = 'HIQkwDMaCjsPL1qgJ3fcHQnQn/1QeuZ2IeCZ/MJVmiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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