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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8092c51ed4c57085cb6aa5d0a7edd1fe8dcad73dbae4c789aba83030809442a9' 
  AND token = 'Q4vidbL7TBPziZFY6aWuHAi8dgQRck9jXBESh1Ebvfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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