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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83be852d5157b2308b7e66d7847fb7a9cdc49b86dbed4f99ede532274990210c' 
  AND token = 'PL9ykAsX6+87X1u2rLr/RgxRLkZIqvN9EpoXZXIUW1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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