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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52b7b19b4f183525208974eda1b8d33279a655d0d4c112ad1e03deb25aeb4fea' 
  AND token = 'S8gsAiuwr/nb0nySY7kbtOHv5ogN0xPRkJqsteUtByI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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