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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c200b38e790a95c5d9c0876c5f9e190b0d8f3615d75c8fd00607de87e6ddb1a' 
  AND token = 'WczT4Mcg93ZeoqUY81t+XhLiZUFFJ4ohGvNlOc8p6wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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