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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5922db2010e2bb6a4b7de6de6ad81c74b2b6dc81fc0e84e0ff3a03fa17ad4bdf' 
  AND token = '942GeOxjjM9kSB7hOVj2xB6nKaaGAK5GWSQYN2xaPfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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