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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb685f7c97a82e9554705d03a3642a9a160be0d00fee25932dc4f53ec4f56515' 
  AND token = '6kWPgAjrMrEG6ykQylaVFJPTig2x2ac4/cm8bg+Xx9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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