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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0ed57ae18043de4724b2f2aaa389412c44ad513a400ef4ed41d3f84d3c246cb' 
  AND token = 'LHaXa6UFbZcQ7NpOoVKEtydkh118YjxJLGmAJsyF4yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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