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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ea01411d603575222b37155f5b65000d5f163c00bbc4d3a020b0cd1adf3ccc1' 
  AND token = 'ht/UHEAnDR60LFDhmqKSlrhaqnqIb7BEuMYxAfpoPvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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