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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5df1483f16816a1aba5d5c7e7a12b9c528d9fa91245d29cfc437744b1fc50fb' 
  AND token = '0c4G8JIsKJqk3y6c7oaEH8jUatLfqcY+QuEVKb1wKg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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