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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37b6077262107a9d775ee908a35b75bca924f2f7390eb7365c1a04e9140d3f53' 
  AND token = '9kZnFY3ZYLtwc9NShbAtfo7oQdHJ1Uq4q3LS4BbIcRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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