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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cc8be7c22ec0c3a74c031d15d3e5f0636da5a1bfebdf618fd9af41f83a0e2cf' 
  AND token = 'rqERLW0t6ntb7CkQBdUqd85d50gOIGNFQ7rKOvGRcb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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