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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bed1a089db2b4452f47cb7187e1b0d7c1a97753c9a8fd5d62c4d52e4e5da993e' 
  AND token = 'LfKWQMk2a3zveeH6DFInm90O/9CdEEeF4/hZxT+nJdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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