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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41125ed21f3f952d83a51240e25e0ebd3c94a1af92ca418d0f9f3f2d3f93ebfb' 
  AND token = 'YR7hKVOUbEFrraNopNTnZURX44VMU/9UXHhizVNN1fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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