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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e1a0c23d954755a505eee8dba9ef9cc7b48c1d0c27b03abec2eb6b16f60fd99' 
  AND token = 'bYyg6eGgbaNEASQkpz7eoVSRfvfmd0GXYr9e44FIfT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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