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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4bd5d5c5b5b965ba201399c21ae5141724d35e9e14fb0a08078064921493ee5' 
  AND token = 'RuBWl9yCaPT0h7Mg8YBRzvgK7Ib3oWrikQgjP90We18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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