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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb928e6ce614a0e5169d1d548c88b7bdcf0adeef982ac1755fa54b6e863f7be9' 
  AND token = 'mgINRG4wFphdRl51PYg1TRgnVqxdnnprqhYBUA4R/mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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