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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abae37e314aa4620ad13c15a055c3df639eda967ef906c1ac84c361e1e6d413f' 
  AND token = '7iBcu9iIMqpRahL6Hh0Lf4/LQHqIFdEynC/I5TBG2C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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