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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e53f781231c7dba17ddef57bc44b8923c7f3e95b6164394deea7437c0d16dd5' 
  AND token = 'F9Nfe0wdq95dnfkaArp77nQltoW64Cgrv+Umnt3LUUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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