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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdc1acb22b67d9c07c5ce8b3b7350c255d4560edd78b707cf863f6423f685b5b' 
  AND token = 'p1IBB7g317NjS0HGzh4+830K/Z8fi2C7ZpBM8ohFfLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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