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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffca8bde417d425e076a533c3287dd99a3e723d5b44c9d94d565be1a7e8acccd' 
  AND token = '6TRIj3KTeRJvLYk2iIIf4IAUK0mjbBxZvTyLJjmkiAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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