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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf01de9baa608d5a17e2599ca3a41b69134acdca48db23102990fb3bec11e821' 
  AND token = 'C/lTxvh3kgzs9SMNwrY4L2ViryadSE7hU+bRkGz8GKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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